71660441 has 2 divisors, whose sum is σ = 71660442. Its totient is φ = 71660440.

The previous prime is 71660431. The next prime is 71660443. The reversal of 71660441 is 14406617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66912400 + 4748041 = 8180^2 + 2179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71660441 is a prime.

Together with 71660443, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71660443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35830220 + 35830221.

It is an arithmetic number, because the mean of its divisors is an integer number (35830221).

Almost surely, 2^71660441 is an apocalyptic number.

It is an amenable number.

71660441 is a deficient number, since it is larger than the sum of its proper divisors (1).

71660441 is an equidigital number, since it uses as much as digits as its factorization.

71660441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 71660441 is about 8465.2490217359. The cubic root of 71660441 is about 415.3617419759.

The spelling of 71660441 in words is "seventy-one million, six hundred sixty thousand, four hundred forty-one".